Incorporate working strlcpy from current RHEL8_4_STABLE branch.

diff --git a/configure.in b/configure.in
index 156fb20..2609654 100644
--- a/configure.in
+++ b/configure.in
@@ -930,7 +930,7 @@ else
   AC_CHECK_FUNCS([fpclass fp_class fp_class_d class], [break])
 fi
 
-AC_REPLACE_FUNCS([crypt fseeko getopt getrusage inet_aton random rint srandom strdup strerror strtol strtoul unsetenv])
+AC_REPLACE_FUNCS([crypt fseeko getopt getrusage inet_aton random rint srandom strdup strerror strlcpy strtol strtoul unsetenv])
 
 # System's version of getaddrinfo(), if any, may be used only if we found
 # a definition for struct addrinfo; see notes in src/include/getaddrinfo.h.
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index d344ecd..dc45613 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -410,6 +410,9 @@
 /* Define to 1 if you have the <string.h> header file. */
 #undef HAVE_STRING_H
 
+/* Define to 1 if you have the `strlcpy' function. */
+#undef HAVE_STRLCPY
+
 /* Define to 1 if you have the `strtol' function. */
 #undef HAVE_STRTOL
 
diff --git a/src/include/port.h b/src/include/port.h
index 3fb9b78..59a0c4d 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -312,7 +312,11 @@ extern int	inet_aton(const char *cp, struct in_addr * addr);
 #endif
 
 #ifndef HAVE_STRDUP
-extern char *strdup(char const *);
+extern char *strdup(const char *str);
+#endif
+
+#ifndef HAVE_STRLCPY
+extern size_t strlcpy(char *dst, const char *src, size_t siz);
 #endif
 
 #ifndef HAVE_RANDOM
diff --git a/src/interfaces/ecpg/ecpglib/Makefile b/src/interfaces/ecpg/ecpglib/Makefile
index fe4933a..7b318ef 100644
--- a/src/interfaces/ecpg/ecpglib/Makefile
+++ b/src/interfaces/ecpg/ecpglib/Makefile
@@ -26,7 +26,7 @@ LIBS := $(filter-out -lpgport, $(LIBS))
 
 OBJS= execute.o typename.o descriptor.o data.o error.o prepare.o memory.o \
 	connect.o misc.o path.o exec.o \
-	$(filter snprintf.o, $(LIBOBJS))
+	$(filter snprintf.o strlcpy.o, $(LIBOBJS))
 
 SHLIB_LINK = -L../pgtypeslib -lpgtypes $(libpq) \
 	$(filter -lintl -lssl -lcrypto -lkrb5 -lcrypt -lm, $(LIBS)) $(PTHREAD_LIBS)
@@ -46,7 +46,7 @@ include $(top_srcdir)/src/Makefile.shlib
 # necessarily use the same object files as the backend uses. Instead,
 # symlink the source files in here and build our own object file.
 
-path.c exec.c snprintf.c: % : $(top_srcdir)/src/port/%
+path.c exec.c snprintf.c strlcpy.c: % : $(top_srcdir)/src/port/%
 	rm -f $@ && $(LN_S) $< .
 
 path.o: path.c $(top_builddir)/src/port/pg_config_paths.h
@@ -62,7 +62,7 @@ installdirs:
 uninstall: uninstall-lib
 
 clean distclean maintainer-clean: clean-lib
-	rm -f $(OBJS) path.c exec.c snprintf.c
+	rm -f $(OBJS) path.c exec.c snprintf.c strlcpy.c
 
 depend dep:
 	$(CC) -MM $(CFLAGS) *.c >depend
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c8aca1b..e8bbd01 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -31,7 +31,7 @@ LIBS := $(patsubst -lpgport,, $(LIBS))
 OBJS=	fe-auth.o fe-connect.o fe-exec.o fe-misc.o fe-print.o fe-lobj.o \
 	fe-protocol2.o fe-protocol3.o pqexpbuffer.o pqsignal.o fe-secure.o \
 	md5.o ip.o wchar.o encnames.o noblock.o pgstrcasecmp.o thread.o \
-	$(filter crypt.o getaddrinfo.o inet_aton.o open.o snprintf.o strerror.o, $(LIBOBJS))
+	$(filter crypt.o getaddrinfo.o inet_aton.o open.o snprintf.o strerror.o strlcpy.o, $(LIBOBJS))
 
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
@@ -77,7 +77,7 @@ backend_src = $(top_srcdir)/src/backend
 # For port modules, this only happens if configure decides the module
 # is needed (see filter hack in OBJS, above).
 
-crypt.c getaddrinfo.c inet_aton.c noblock.c pgstrcasecmp.c snprintf.c strerror.c open.c thread.c: % : $(top_srcdir)/src/port/%
+crypt.c getaddrinfo.c inet_aton.c noblock.c open.c pgstrcasecmp.c snprintf.c strerror.c strlcpy.c thread.c: % : $(top_srcdir)/src/port/%
 	rm -f $@ && $(LN_S) $< .
 
 md5.c ip.c: % : $(backend_src)/libpq/%
@@ -144,7 +144,7 @@ uninstall: uninstall-lib
 	rm -f $(DESTDIR)$(includedir)/libpq-fe.h $(DESTDIR)$(includedir_internal)/libpq-int.h $(DESTDIR)$(includedir_internal)/pqexpbuffer.h
 
 clean distclean: clean-lib
-	rm -f $(OBJS) pg_config_paths.h crypt.c getaddrinfo.c inet_aton.c noblock.c pgstrcasecmp.c snprintf.c strerror.c open.c thread.c md5.c ip.c encnames.c wchar.c pthread.h
+	rm -f $(OBJS) pg_config_paths.h crypt.c getaddrinfo.c inet_aton.c noblock.c pgstrcasecmp.c snprintf.c strerror.c open.c thread.c md5.c ip.c encnames.c wchar.c pthread.h strlcpy.c
 	rm -f pg_config_paths.h	# Might be left over from a Win32 client-only build
 
 maintainer-clean: distclean
diff --git a/src/port/strlcpy.c b/src/port/strlcpy.c
new file mode 100644
index 0000000..5186634
--- /dev/null
+++ b/src/port/strlcpy.c
@@ -0,0 +1,71 @@
+/*-------------------------------------------------------------------------
+ *
+ * strlcpy.c
+ *	  strncpy done right
+ *
+ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
+ *
+ *
+ * IDENTIFICATION
+ *	  $PostgreSQL: pgsql/src/port/strlcpy.c,v 1.6 2009/01/01 17:24:04 momjian Exp $
+ *
+ * This file was taken from OpenBSD and is used on platforms that don't
+ * provide strlcpy().  The OpenBSD copyright terms follow.
+ *-------------------------------------------------------------------------
+ */
+
+/*	$OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $	*/
+
+/*
+ * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "c.h"
+
+
+/*
+ * Copy src to string dst of size siz.	At most siz-1 characters
+ * will be copied.	Always NUL terminates (unless siz == 0).
+ * Returns strlen(src); if retval >= siz, truncation occurred.
+ * Function creation history:  http://www.gratisoft.us/todd/papers/strlcpy.html
+ */
+size_t
+strlcpy(char *dst, const char *src, size_t siz)
+{
+	char	   *d = dst;
+	const char *s = src;
+	size_t		n = siz;
+
+	/* Copy as many bytes as will fit */
+	if (n != 0)
+	{
+		while (--n != 0)
+		{
+			if ((*d++ = *s++) == '\0')
+				break;
+		}
+	}
+
+	/* Not enough room in dst, add NUL and traverse rest of src */
+	if (n == 0)
+	{
+		if (siz != 0)
+			*d = '\0';			/* NUL-terminate dst */
+		while (*s++)
+			;
+	}
+
+	return (s - src - 1);		/* count does not include NUL */
+}